Dental plugger.



W. WEICI-ISELBMIMlv DENTAL PLUGGEB.

' 'APPLIOATION FILEDSEPT. 25, 1906. 91 5,1 37.

Patented Mar. 16, 1909.

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my @Wha WILLIAM WEICHSELBAUM, OF SAVANNAH, GEORGIA.

DENTAL PLUGGER.

Specification of Letters Patent.

Patented March 16, 1909.

Application led September 25, 1906. Serial No. 336,181.

To all whom it may concern:

Be it known that I, I/VILLIAM ViTnIoHsEL- BAUM, a citizen of the United States, residing at Savannah, in the county of Chatham and State of Georgia, have invented a certain new and useful Improvement Relating to Dental Pluggers, and I do hereby declare that the following is a full and exact description thereof.

My improved plugger is capable of being used either with the ordinary long-known thrusting motion or with a lateral motion. I have in my experiments effected the lateral motion at an exactly right angle to the central line of the instrument, and will describe the instrument as thus constructed, but it will be understood that the angle may beumade greater or less.

The improved instrument with its provision for striking laterally, makes possible and easy, work not before attainable. By a change, easily made, the main portion of the same instrument presents an approved form of the ordinary direct thrusting instrur ment.

It is important in dental work, in compacting the filling within a cavity, to act with considerable force at the point of the plugger without much jarring the tooth. This condition has long been attained by using a light plugger with a quick striking motion. I do the same. My improved instrument attains this end not only with the direct thrusting blows, but also with the lateral blows. The train of connection is unusually simple and frictionless, the return motion is attained by separate springs for the several parts.- Provision is Varranged for changing from angular to direct plugging. The tool in either condition is slender and convenient, gives a wide range of variations in the force of the blows and attains any required change in the force by turning one conveniently arranged thumb-screw- The following is a description of what I consider the best means of carrying out the invention.

The accompanying drawing of this specification.

Figure l shows the instrument prepared for lateral action. It is a central longitudinal section with the plugger at rest but with the cam nearly in position for liberating it and striking the gentle blow. Fig. 2 is a corresponding section of a portion on a larger scale, showing the condition which obtains forms a part when the blowl has been struck. Fig. 3 is a cross-section on the line 3 3 in Fig. l viewed from the left. It is on a still larger scale. Fig. 4 shows the cam, giving two corresponding views on the Same scale as Fig. 3. The upper part is a face view seen from the left, the lower part is an elevation. Fig. 5 is a longitudinal section of the working end of the instrument on the same small scale as Fig. l, adjusted for thrusting in a direct line. Fig. 6 is a side view showing another modification.

Similar letters of reference indicate like parts in all the figures where they appear.

A is the tang, a tubular piece, which it will be understood is screw-threaded, as partly shown, to engage at one end with the arbor of a standard dental engine, not shown, and at the opposite end to engage with a handpiece, A1, constituting an extension of the casing.

A5 is a centrally bored block, screwthreaded within both the tang A and the hand piece A1 and constitutes a coupling firmly uniting them and also a bearing for a rotary shaft B, which latter carries a facecam B2 and also provides an end pressure bearing for such cam, and being connected by the coupling piece B3, with a connection from the ordinary dental engine not shown, operates with the obvious rotary motion. The working face of the cam B2 is inclined so as to lift gradually and has an abrupt shoulder so that it will release suddenly.

C is a spiral spring housed in a cylindrical chamber forming a part of the hand-piece Al and extending parallel to, but cons1derably out of, the center line of the casing.

D is a screw serving as an abutment for the spring and which can be turned to adjust its force with delicacy, making it very slight if such be required, but its force must be suiiicient to overcome two gentle opposing springs to be presently described.

Referring to Figs. l, 2, 3 and 4, E1, E2 is a lever which can be rocked on a shaft or pivot E, one end E2 subject to the action of the spring C and cam B2, and the other end E1, extending across the path of a longitudinally movable bar G.

The slender portion A2 of the casing adjusted to extend into and operate in small spaces, is rigidly connected to the larger portion 1parallel thereto. This slender portion is s otted and provided with a pivot to receive, and allow the rocking of, a bellcrank lever. Another part A2, is held stiffly at right angles to A2, and supports and guides a plu ger-point-carrier I and pluggerpoint I1. t also carries a gentle spiral spring J, which latter is coiled under the enlarged head oi' the carrier I, and is adapted to exert only so much force as is required to bring the point-carrier I and the point I1 in again after each blow. It urges the bellcrank lever H1 into its inward, or relaxed position, that shown in Fig. 1.

K is a gentle spiral spring housed in a longitudinal groove g, near the midlength of the bar G. -One end oi this spring abuts against one end oi the groove g, the other end abuts against a screw-pin AG set in a tapped hole in the part A1, as shown in Fig. 1.

As thus adjusted the instrument is ready to plug by a rapid succession of lateral blows graduated with all the delicacy of the most complete direct thrusting blows. It will be seen that each revolution oi the cam B2, rocks the lever E1 E2 in the direction to compress the strong spring C and allow the ieebler springs J and K to extend and cause the point-carrier I with its plugger-point I1 to draw inward and the bar G to move toward the cam. Now all the parts are conditioned as shown in Fig. 1. The further turning oi' the cam B2 presents its square shoulder and liberates the lever E1 E2 which urged by the spring C and rocking suddenly, acts by its end E1 against the bar G, and the latter moving end-wise strikes the lever II and rocks this lever into the osition shown in Fig. 2 and gives a blow by tiie point I1. It is easy to make this of just the force required by simply adjusting the screw D, leaving the weaker springs J and K to act only sufficient to insure that the oint-carrier I1 will be drawn inward and tile bar G moved backward roperly after each blow.

Modiications may be made without departing from the principle or sacrificing the advantages of the invention. The transversely-moving point-carrier I, may be shorter `than shown and it may be of advantage in some work to have it so. There may be a shorter point I1. The screw-coupling a may be nearer to the lever II1 by lengthening the part A1 and shortening the part A2. Such may be preferred by some as better guiding the point in direct plugging.

My instrument is changed to the condition for ordinary work, making direct blows in a straight line, by unscrewing the L-shaped casing piece A2 A3, separating it from the part A1 at the coupling-joint a, and substi- .tuting an ordinary plugger-point which I Will describe as the same piece I1, but which may be any other according to the nature of the direct plugging to be done. Such is shown in Figs. 5 and 6.

Parts ofthe invention can be used without the whole. I can dispense with the light spring K and with the screw-pin A6 to serve as abutment therefor by using a correspondingly stiffer spring J under the head of the point-carrier in each position. I prefer the whole as shown.

I claim as my invention 1. In a dental plugger a casing adapted to be held and guided by the operator, having a slender portion adapted to reach into contracted spaces provided with a right angularly disposed head, a tool holder located in such head, a device pivotally seated therein and adapted to contact with the tool holder, a longitudinally reciprocating bar in said slender portion adapted to contact with said device, reaching also into a larger portion of the casing, a helical spring in said larger portion extending substantially parallel to said bar, a lever arranged to engage said parts and a rotary shaft carrying a face-cam and means for operatively connecting it to a source of power.

2. In a dental plugger a casing ada ted to be held and guided by the operator, aving a slender portion adapted to reach into contracted spaces provided with a right angularly disposed head, a tool holder located in such head, a device pivotally seated therein and adapted to contact with the tool holder, a longitudinally reciprocating bar in said slender portion adapted to contact with said device reaching also into a larger portion of the casing, a helical spring in said larger portion extending substantially parallel to said bar, a screw also parallel to said bar for adjusting the force of said spring, a lever arranged to engage said parts and a rotary shaft carrying a face-cam and means for operatively connecting it to a source of power.

3. In a dental plugger a casing adapted to be held and guided by the operator, having a slender portion adapted to reach into contracted spaces, provided with a iight angularly disposed head, a tool holder located in 110 such head, a device pivotally seated therein and adapted to contact with the tool holder,

a longitudinally reciprocating bar in said slender portion reaching also into a larger portion of the casing, a helical spring in such 115 larger portion extending substantially parallel to said' bar, a screw also parallel to said bar for adjusting the force of said spring, a lever arranged to engage said parts and a rotary shaft carrying a face-cam and means 120 for operatively connecting it to a source of power and springs of lesser force for returning the tool and reciprocating-bar after each stroke, all substantially as herein specified.

4. In a dental plugger a casing ada ted 125 to be held and guided by the operator, iaving a slender portion adapted to reach into contracted spaces provided with a right angularly disposed head, a tool holder located in such head, a device pivotallybseated there- 130 in and adapted to Contact with the tool rotary shaft and forming an end hearing for holder, a longitudinally reciprocating-bar in the face-earn, all substantially as herein said slender portion reaching also'into a speeied.

larger portion ofthe casing, a helical spring Signed at Savannah in the county of 15 5 in said portion extending substantially paral- Chatham and State of Georgia this 15th day lel to said r3-ar, a lever arranged to engage of September A. D. 1906.

said parts and a rotary shaft carryinfT a facecam and means for operatively oonnoting it l YVILLIAM VEICHSELBAUM' to a source of power and an inolosed block Witnesses: 10 performing the functions of rigidly coupling l J. C. BUTNER,

certain sections of the easing supporting the GORDON PEEK. 

